The Caloritech™ R851B Electronic Step Control is frequently used in boiler and duct heater systems to bring on stages a few seconds apart. As the process reaches set point, stages will drop out until the required heat balances the losses. Under steady state operation, some stages remain on and one or two stages may cycle to maintain straight line control.
Features & Benefits At A Glance
- models available to support 4 or 8 stages
- 0-135 Ω 2-10 VDC 4-20 mA input signal
- 10Amp 240 VAC MAX relay rating
- 24 VAC power
- dimensions are 6 3/4" x 5" x 3"